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  • 1
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    Rising CO2 and increased light exposure synergistically reduce marine primary productivity (2012)
    PANGAEA
    In:  Supplement to: Gao, Kunshan; Xu, Juntian; Gao, Guang; Li, Yahe; Hutchins, David A; Huang, Bangqin; Wang, Lei; Zheng, Ying; Jin, Peng; Cai, Xiaoni; Häder, Donat-Peter; Li, Wei; Xu, Kai; Liu, Nana; Riebesell, Ulf (2012): Rising CO2 and increased light exposure synergistically reduce marine primary productivity. Nature Climate Change, 2, 519–523, https://doi.org/10.1038/nclimate1507
    Details
    Publication Date: 2024-03-15
    Description: Carbon dioxide and light are two major prerequisites of photosynthesis. Rising CO2 levels in oceanic surface waters in combination with ample light supply are therefore often considered stimulatory to marine primary production. Here we show that the combination of an increase in both CO2 and light exposure negatively impacts photosynthesis and growth of marine primary producers. When exposed to CO2 concentrations projected for the end of this century, natural phytoplankton assemblages of the South China Sea responded with decreased primary production and increased light stress at light intensities representative of the upper surface layer. The phytoplankton community shifted away from diatoms, the dominant phytoplankton group during our field campaigns. To examine the underlying mechanisms of the observed responses, we grew diatoms at different CO2 concentrations and under varying levels (5-100%) of solar radiation experienced by the phytoplankton at different depths of the euphotic zone. Above 22-36% of incident surface irradiance, growth rates in the high-CO2-grown cells were inversely related to light levels and exhibited reduced thresholds at which light becomes inhibitory. Future shoaling of upper-mixed-layer depths will expose phytoplankton to increased mean light intensities. In combination with rising CO2 levels, this may cause a widespread decline in marine primary production and a community shift away from diatoms, the main algal group that supports higher trophic levels and carbon export in the ocean.
    Keywords: A4_SCS; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); C3_SCS; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Chlorophyll a; Chromista; Coast and continental shelf; DATE/TIME; Duration; E606_SCS; East China Sea; Entire community; Event label; Figure; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; In situ sampler; Irradiance; Irradiance, standard deviation; ISS; Laboratory experiment; LE04_SCS; Light; Non photochemical quenching; Non photochemical quenching, standard deviation; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phaeodactylum tricornutum; Phosphate; Phytoplankton; PN07_ECS; Potentiometric; Primary production/Photosynthesis; Primary production of carbon; Primary production of carbon, per chlorophyll a; Primary production of carbon, per volume of seawater; Primary production of carbon, standard deviation; Salinity; Season; SEATS_SCS; Single species; Skeletonema costatum; South China Sea; Species; Temperate; Temperature, water; Thalassiosira pseudonana; Time of day; Treatment; Tropical; Yield ratio
    Type: Dataset
    Format: text/tab-separated-values, 17109 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum (2012)
    PANGAEA
    In:  Supplement to: Li, Yahe; Gao, Kunshan; Villafañe, Virginia E; Helbling, E Walter (2012): Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum. Biogeosciences, 9(10), 3931-3942, https://doi.org/10.5194/bg-9-3931-2012
    Details
    Publication Date: 2024-03-15
    Description: Increasing atmospheric CO2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In order to evaluate the combined effects of ocean acidification, UV radiation and temperature, we used the diatom Phaeodactylum tricornutum as a model organism and examined its physiological performance after grown under two CO2 concentrations (390 and 1000 µatm) for more than 20 generations. Compared to the ambient CO2 level (390 µatm), growth at the elevated CO2 concentration increased non-photochemical quenching (NPQ) of cells and partially counteracted the harm to PS II (photosystem II) caused by UV-A and UV-B. Such an effect was less pronounced under increased temperature levels. The ratio of repair to UV-B induced damage decreased with increased NPQ, reflecting induction of NPQ when repair dropped behind the damage, and it was higher under the ocean acidification condition, showing that the increased pCO2 and lowered pH counteracted UV-B induced harm. As for photosynthetic carbon fixation rate which increased with increasing temperature from 15 to 25 °C, the elevated CO2 and temperature levels synergistically interacted to reduce the inhibition caused by UV-B and thus increase the carbon fixation.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Chromista; Damage/repair ratio; Damage/repair ratio, standard deviation; Damage rate; Damage rate, standard deviation; Effective quantum yield; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Laboratory experiment; Laboratory strains; Light; Net photosynthesis rate, per cell; Net photosynthesis rate, standard deviation; Non photochemical quenching; Non photochemical quenching, standard deviation; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phaeodactylum tricornutum; Potentiometric; Primary production/Photosynthesis; Repair rate; Repair rate, standard deviation; Salinity; Single species; Species; Temperature; Temperature, water; Time in minutes; Treatment; Ultraviolet radiation-induced inhibition of photosynthesis; Ultraviolet radiation-induced inhibition of photosynthesis, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 41489 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Light-modulated responses of growth and photosynthetic performance to ocean acidification in the model diatom Phaeodactylum tricornutum (2014)
    PANGAEA
    In:  Supplement to: Li, Yahe; Xu, Juntian; Gao, Kunshan (2014): Light-Modulated Responses of Growth and Photosynthetic Performance to Ocean Acidification in the Model Diatom Phaeodactylum tricornutum. PLoS ONE, 9(5), e96173, https://doi.org/10.1371/journal.pone.0096173
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification (OA) due to atmospheric CO2 rise is expected to influence marine primary productivity. In order to investigate the interactive effects of OA and light changes on diatoms, we grew Phaeodactylum tricornutum, under ambient (390 ppmv; LC) and elevated CO2 (1000 ppmv; HC) conditions for 80 generations, and measured its physiological performance under different light levels (60 µmol/m**2/s, LL; 200 µmol/m**2/s, ML; 460 µmol/m**2/s, HL) for another 25 generations. The specific growth rate of the HC-grown cells was higher (about 12-18%) than that of the LC-grown ones, with the highest under the ML level. With increasing light levels, the effective photochemical yield of PSII (Fv'/Fm') decreased, but was enhanced by the elevated CO2, especially under the HL level. The cells acclimated to the HC condition showed a higher recovery rate of their photochemical yield of PSII compared to the LC-grown cells. For the HC-grown cells, dissolved inorganic carbon or CO2 levels for half saturation of photosynthesis (K1/2 DIC or K1/2 CO2) increased by 11, 55 and 32%, under the LL, ML and HL levels, reflecting a light dependent down-regulation of carbon concentrating mechanisms (CCMs). The linkage between higher level of the CCMs down-regulation and higher growth rate at ML under OA supports the theory that the saved energy from CCMs down-regulation adds on to enhance the growth of the diatom.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value; Carbon, inorganic, dissolved, reciprocal of photosynthetic affinity value, standard deviation; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, reciprocal of photosynthetic affinity value; Carbon dioxide, reciprocal of photosynthetic affinity value, standard deviation; Carotenoids, standard deviation; Carotenoids per cell; Chlorophyll a, standard deviation; Chlorophyll a per cell; Chlorophyll c, standard deviation; Chlorophyll c per cell; Chromista; Effective photochemical quantum yield; Effective photochemical quantum yield, standard deviation; Effective quantum yield; Effective quantum yield, standard deviation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Irradiance; Laboratory experiment; Laboratory strains; Light; Non photochemical quenching; Non photochemical quenching, standard deviation; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; pH, standard deviation; Phaeodactylum tricornutum; Phytoplankton; Potentiometric; Primary production/Photosynthesis; Salinity; Single species; Species; Temperature, water; Time in days; Time in minutes; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 3778 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Rising CO2 and increased light exposure synergistically reduce marine primary productivity (2012)
    Nature Publishing Group
    In:  Nature Climate Change, 2 . pp. 519-523.
    Details
    Publication Date: 2019-09-23
    Description: Carbon dioxide and light are two major prerequisites of photosynthesis. Rising CO2 levels in oceanic surface waters in combination with ample light supply are therefore often considered stimulatory to marine primary production(1-3). Here we show that the combination of an increase in both CO2 and light exposure negatively impacts photosynthesis and growth of marine primary producers. When exposed to CO2 concentrations projected for the end of this century(4), natural phytoplankton assemblages of the South China Sea responded with decreased primary production and increased light stress at light intensities representative of the upper surface layer. The phytoplankton community shifted away from diatoms, the dominant phytoplankton group during our field campaigns. To examine the underlying mechanisms of the observed responses, we grew diatoms at different CO2 concentrations and under varying levels (5-100%) of solar radiation experienced by the phytoplankton at different depths of the euphotic zone. Above 22-36% of incident surface irradiance, growth rates in the high-CO2-grown cells were inversely related to light levels and exhibited reduced thresholds at which light becomes inhibitory. Future shoaling of upper-mixed-layer depths will expose phytoplankton to increased mean light intensities(5). In combination with rising CO2 levels, this may cause a widespread decline in marine primary production and a community shift away from diatoms, the main algal group that supports higher trophic levels and carbon export in the ocean.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/NCLIMATE1507
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Characterization of Middle-Temperature Gasification Coal Tar. Part 1: Bulk Properties and Molecular Compositions of Distillates and Basic Fractions (2012)
    American Chemical Society (ACS)
    Details
    Publication Date: 2012-08-21
    Description: Energy & Fuels DOI: 10.1021/ef3007323
    Print ISSN: 0887-0624
    Electronic ISSN: 1520-5029
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society (ACS)
    Location Call Number Limitation Availability
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    PAPER CURRENT
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